Morkis isbell



@niet gaat tant @frita MORRIS ISBELL, CF NEW HAVEN, CONNECTICUT Letters.Patent No. 64,423, dated Jifay 7, 1867.

IMPROVEMENT IN HOLL-0W Al-IGERS.

Q'tlge Srlgtmle referat tu in there tetten nteut mit mating ,part nftige sana.

TO ALL WHOM IT MAY CONCERN: l

Be it known that I, MORRIS ISBELL, of' New Haven, in the county of NewHaven, and State of Connecticut, have invented a new Improvement inHollow Auger; and I do hereby declare the following, when taken inconnection with thc accompanying drawings, and the letters of' referencemarked thereon, to be a full, clear, and exact description of the same,and which said drawings constitute part of this specification, andrepresent, in-

Figure 1,' a side view Figure 2, an edge view; and in Figure 3 an endviewh or for d size This invention relates to that class of angers orinstruments used for forming tenons upon spokes, like purposes, andconsists in the peculiar construction wherebyit is made easilyadjustable to any require of tenon within certain limits.

To enable others to construct and use my improvement, I will proceed todescribe the same as illustrated inthe accompanying drawings. i A

A is the shank, formed to i'it the mandrel or shaft b y whichthe augeris revolved. of the head of the auger, formed upon elastic springs C,which -are united upon or so as to form the shank, as seen in fig. 1.Around the head is placed a metallic band, D, (see lig. 3,) throughwhich a set-screw E passes, bearing upon one of thc parts of the head,so that by turning in the screw the two parts of the head are forcedtoward each other, and by releasing the screws the reac'ticuof thesprings forces the two parts of the head asunder. Between the two headsa space is formed, sufliciently largefor the largest tenon to be formed,and in each of the parts oi' the said head is fixed a cutter, I,extending through to the face, as seen in fig. 3, and denoted by brokenlines, fig. 2, and each cutter secured in its place by a set-screw, L,or otherwise, and each of the cutters provided with a throat, T, throughthe head, to permit the shavings to pass freely out. The band D passing,as it does, entirely around the head, and of sui'lcient strength,serves` to hold the two parts of the head firmly in the proper positionrelative to each other. Thus is produced a hollow auger extremelysimple, durable, and cheap in its construction7 and easily adjusted forcutting diiTcrent-size tenons.

vI do not broadly claim an adjustable hollow auger, as vsuch are commonand well known.

Having, therefore, thus fully described my invention, what claim as newand useful, and desire to secure B B are the two parts Thedivided headB, in combination with the springs C C, the band D, and the adjustingscrew E, all construeted and arranged to operate substantially in themanner described.

MORRIS ISBELL. Witnesses JouN E. EARLE,

A. J. TIBBITS.

